tourmaline

3 ENTRIES FOUND:

tour·ma·line

noun \ˈtr-mə-lən, -ˌlēn\

Definition of TOURMALINE

:  a mineral of variable color that consists of a complex borosilicate and is valued as a gem when transparent and cut

Origin of TOURMALINE

Sinhalese toramalli carnelian
First Known Use: 1759

Other Mineralogy Terms

agate, host, inclusion, matrix, streak

tourmaline

noun    (Concise Encyclopedia)

Complex silicate mineral that is often used as a gemstone. Three types of tourmaline, distinguished by the presence of certain elements, are usually recognized: iron tourmaline (schorl) is black, magnesium tourmaline (dravite) is brown, and alkali tourmalines may be pink, green, blue, or colourless. Tourmaline is most common in granite pegmatites. Gem-quality stones are found especially in the U.S., Brazil, Russia, and Madagascar.

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